Discord is a delivery channel, not a publisher — one message isn't one
post. When this is on, FC groups a creator's variant drop (same piece,
different hair colour or outfit) into a single post it authors, with the
messages' text as the body. Grouped posts are always marked as FC's own,
and deleting one returns its messages to the feed unchanged.
0 is identical, 1 is unrelated. Lower groups less. Raising this is
the fix when a drop comes out scattered across several posts —
but raise it slowly: too high merges pieces that only look alike.
The quiet gap that ends a drop, measured between consecutive
messages — so variants trickling out over an evening stay one post.
This is the setting doing most of the work: without it, everything
an artist ever drew of one character would collapse into one post.